Some plants of the tundra can perform photosynthesis at lower than normal light levels.
Barren
Lots and lots
Treeless plain
Cold
Tundra can be found on the tops of some mountains.
Dense fat, with thick fur that covers all external surfaces
Keeping their extremities relatively cold
Special bones in their nose that help them save water
All of the above
30%
20%
10%
50%
Shedding one color coat for another helps them stay camouflaged in most seasons
The changing fur has no real purpose
The animals try to keep up with the newest styles
The cold causes fur to change colors
What happens to plants when they freeze
Permanent frost
Any frozen soil
Soil that stays frozen for two or more years